Akedia

Akedia (in Latin, accidie) is literally fatigue or exhaustion, but in technical usage refers to the spiritual and physical lethargy which can plague those pursuing the eremetic life. The reference in Psalm 90 (91 MT) to the "demon of noonday" is traditionally identified as akedia. It can take the form of listlessness, dispersion of thoughts, or being inattentively immersed in useless activity.